before your 4cyl ranger had coil packs, it had a wast spark system I believe, which mandates a minimum of double platnum because the spark fires tail to tip as well as tip to tail.
a copper or single plat plug will wear down super quickly..
OE is the motorcraft finewire double plat plug.
the autolite double plat should have been perfectly fine.
I believe MC's are made by autolite anyway.
Could the plug not be gapped right?
as for NGK vs. Denso.. I'm more for NGK and they fire well in everything. for european cars, we only recommend NGK. We simply fight with people if they want to run bosch. the quality just isn't there, and they tend to misfire and foul out quicker.
champions.. well.. I think they're still made specifically for chryslers, jeep and mitsubishi. in anything else they just don't work to well.
I almost laughed at the federal mogul rep a few years ago, he insisted that champion plugs were OE for 70% of all, and I mean ALL cars in the world. What a line of [censored]. So I stupidly said, BMW wouldn't be caught dead with a champion plug. that got me 30 minutes of lecture.. but I still won't sell them unless they're requested or have a jeep or chrysler.
and NGK.. works great in jeeps and chrysler too
